B - Mix Juice

Score : $200$ points

Problem Statement

A shop sells $N$ kinds of fruits, Fruit $1, \ldots, N$, at prices of $p_1, \ldots, p_N$ yen per item, respectively. (Yen is the currency of Japan.)

Here, we will choose $K$ kinds of fruits and buy one of each chosen kind. Find the minimum possible total price of those fruits.

Constraints

• $1 \leq K \leq N \leq 1000$
• $1 \leq p_i \leq 1000$
• All values in input are integers.

Input

Input is given from Standard Input in the following format:

$N$ $K$

$p_1$ $p_2$ $\ldots$ $p_N$

Output

Print an integer representing the minimum possible total price of fruits.

5 3
50 100 80 120 80

210

This shop sells Fruit $1$, $2$, $3$, $4$, and $5$ for $50$ yen, $100$ yen, $80$ yen, $120$ yen, and $80$ yen, respectively.

The minimum total price for three kinds of fruits is $50 + 80 + 80 = 210$ yen when choosing Fruit $1$, $3$, and $5$.

1 1
1000

1000